<!DOCTYPE html>
<html>
    <body>
        <canvas id="myCanvas" width="200" height="100"
        style="border:1px solid #c3c3;">
        Your browser does not support the canvas element.

        </canvas>
        <script type="text/javascript">
        var c=document.getElementById("myCanvas");
        var cxt=c.getContext("2d");
        cxt.fillStyle="red";
        cxt.beginPath();
        cxt.arc(70,18,15,0,Math.PI*2,true);
        cxt.closePath();
        cxt.fill();
        </script>
    </body>
</html>